Can only power off display once.

‎08-20-201109:51 PM - edited ‎08-20-201110:05 PM

So, when I first boot up my computer, I am able to power off my display, either by hitting fn+f3 or by right-clicking the battery and selecting "power off display". Works fine. However, once i turn the screen on by using the keyboard/mouse, neither fn+f3 nor selecting "power off display" works again until the comptuer shuts down, goes to sleep, or hibernates. Then, it works fine again.